Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fc3ad837b3420bc…

MALICIOUS

PDF

76.0 KB Created: 2021-03-24 06:30:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d9e6b326f702dd03626274e43d6ee8b SHA-1: d69642be53dfd97fbd0905cbc4e62b99aa0535db SHA-256: 6fc3ad837b3420bcda0dc235e1665cce9133f8cdd9f393e3eead5ef9b39d3ad8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, 'golowaki.ru', which is likely used to host malicious content or redirect the user. The document body, though heavily obfuscated, contains keywords related to a 'school band', suggesting a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://golowaki.ru/wix?keyword=toisnot+middle+school+band
    • https://static.s123-cdn-static.com/uploads/4468551/normal_60040d9b672c7.pdf
    • https://static.s123-cdn-static.com/uploads/4478408/normal_5fc754a7770ef.pdf
    • https://cdn-cms.f-static.net/uploads/4451750/normal_603bc7d8d47f9.pdf
    • http://istlan.space/how_to_get_a_brother_printer_out_of_error_statejommh.pdf
    • https://cdn-cms.f-static.net/uploads/4450898/normal_6031d7d4da45e.pdf
    • https://cdn-cms.f-static.net/uploads/4501777/normal_6019b9d2026ac.pdf
    • http://rasezatoxefu.mygamesonline.org/kenotimubaju.pdf
    • https://cdn-cms.f-static.net/uploads/4375503/normal_605181584ac22.pdf
    • http://lovelyhouse.online/insurgent_online_freepqnav.pdf
    • https://static.s123-cdn-static.com/uploads/4451927/normal_5ff222139492e.pdf
    • http://ropisunofo.mygamesonline.org/32213701824.pdf
    • http://rozogididibusar.sportsontheweb.net/the_elements_of_statistical_learning.pdf
    • http://easylearning.space/viwowijugewut73vo0.pdf
    • http://insta-sale.site/lananepifavk8y9.pdf
    • http://odemebayisitrafik.com/business_process_modeling_example5z3mo.pdf
    • http://doctora.club/khutbah_gerhana_bulan_bahasa_sunda370wk.pdf
    • http://kyukty68.xyz/nemijafufazuvisowupifexig761mv.pdf
    • https://static.s123-cdn-static.com/uploads/4379379/normal_5fde2e78451d6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lowelomavojezi.myartsonline.com/96591792876.pdf
    • http://gozenabuzixi.onlinewebshop.net/tataxuwadoto.pdf
    • http://najukelosuned.myartsonline.com/90608770826.pdf
    • http://fajazimigig.atwebpages.com/arris_tg852g_login.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed66.bin
c06926b9bef2edb7193fd5b142b735d4083658d3cbe6284b4e3db262510022e0
pdf-font-stream PDF embedded font (sfnt) at offset 0xED66 5172 bytes
font_01_sfnt_off0000fece.bin
692d8fe475a18572074ea9c36c1525ac289ea4e3f56c17a1ac3c0fcd9541723b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFECE 10540 bytes